• Amplified control for up to 16 speakers across 8 output zones
• Simple tamper free usage for non technical operators
• Intelligent control for speaker EQ, DSP for silent switching, priority input switching, timed audio reset, Ethernet control and monitoring
• Industrial grade components for high quality 24/7 operation
• Low cost of ownership with extensive 10 year warranty

This is a high quality power amplifier designed for use in shops/ banks/ offices etc etc. It differs from all other amplifiers on the market in 2 main ways. Firstly it is controlled via an IP network, there are no front panel knobs or buttons for untrained staff to fiddle with. Secondly each loudspeaker output has an infra red remote control volume receiver associated with it. This allows individual speakers to have their volumes adjusted by one common remote control (the amount of level adjustment is of course fully configurable by software via the network).

The amplifier has a total of 4 audio inputs. These are 3 'line level' and 1 mic. Being designed for background music applications the output of the amplifier is mono. There are 8 individual power amplifiers in the GS-LSA001, each has its own output and own infra red receiver for independent remote control of its volume. All 8 amplifiers share the same audio inputs.

For reliability heat dissipation from the amplifiers is done entirely by large heatsinks. Unreliable/ noisy fans are NOT used.

AUDIO INPUTS
There are 4 audio inputs. 3 line level and 1 mic level. One of the line level inputs is a stereo input that has both left & right inputs mixed together inside the amp to form a mono feed. The other 2 line inputs are just mono.
Switching between the audio inputs is done automatically (although it can be forced by the control software if required). The order of input switching is: Stereo Line, Mic, Mono Line 1, Mono Line 2. It was designed in the assumption that the normal background music source would be connected to the stereo line, if a mic was attached and used for instore announcements this would take priority over the music source. The 2 mono line inputs can be used for such things as local adverts or fire alarm/ safety announcements. These 2 mono input shave the highest priority and audio present on either input will turn off the music source and mic.
A highly sophisticated automatic level control system is used to correctly set the gains of the audio inputs. 

LOUDSPEAKER OUTPUTS
There are 8 loudspeaker outputs. Each fed from its own amplifier. For ease of installation the outputs are on RJ45 connectors (cat5). To allow enough power to be supplied to the loudspeakers an audio transformer is required at the loudspeaker (see loudspeakers/ volume remote control). Each output can be set to have its own standard level. This level is set in software during initial installation (it can of course be easily changed via the network later if required). At the start of each day the loudspeakers output is returned to this standard level.

Not all the wires in the cat5 cable connecting the amplifier to the speaker are used for output from the amplifier. Some wires are used for return information from the loudspeaker, such as information from the loudspeakers remote control receiver if a user is trying to change the loudness of a speaker. Other information sent to the amplifier is the type of loudspeaker connected. This allows the amplifier to automatically apply correct equalization curves for the type of loudspeaker connected to an output. There are no issues with connecting several different types of loudspeaker to the same amplifier. 

LOUDSPEAKER REMOTE VOLUME CONTROL
Fitted to each loudspeaker is a remote control receiver. One handheld infrared remote control is supplied with each amplifier. using the remote control it is possible for the loudness of a speaker to be adjusted. The amount that a loudspeaker can be adjusted can be set by the network control software. Each morning the level of each loudspeaker is returned to the original standard set level.

LOCAL BRANCH CONTROL PANEL
A simple to use branch control panel is also supplied with each amplifier. It connects to the amplifier by a single cat5 cable. It has three buttons on it and is usually fitted either at the tills or in the managers office. The three buttons are marked 'BRANCH BUSY', 'BRANCH QUITE' and 'BRANCH NORMAL'. When one of these buttons is pressed the overall volume of the system is altered. The amount the level is changed between normal, busy & quite is of course set via the network control interface. It is possible to have the branch busy volume set either quieter or louder than the branch quite volume. 

EXPANSION
It is possible to connect several amplifiers together. This is done by a single cat5 cable between 2 amplifiers. All the audio inputs from the master amplifier are sent digitally down the cat5 cable to the slave amplifier. Also information from the branch control panel is shared between the master and slave amplifiers. 

NETWORK CONTROL SOFTWARE
A full suite of easy to use controls software is supplied with each amplifier. Just plug the amplifier into your network and assuming that you use DHCP it will be automatically found by the pc running the control software. If you used fixed IP addresses it is easy to fix one. Once the remote pc is connected to the amplifier it is possible to control levels of all the inputs and individual speakers. Levels that can be adjusted using the loudspeaker remote controls and branch control panel can also be set. To save energy it is possible to set the amplifier to automatically turn itself off at a pre set time and then turn itself back on at another preset time. 

• Seattle 7 Manual

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